This provides a better error message when the user tries to run dlv
debug on a directory that does not contain a main package, when `dlv
exec` is used with a source file.

Additionally the architecture of the executable is checked as suggested
by @alexbrainman in #443.

Fixes #509

This function was broken for a very long time until the changes in this
PR fixed it. However I do not think it is desirable to be catapulted
into some other goroutine by 'next' just because that other goroutine
happened to receive a message on a channel.

This feature should be implemented by a new command, not next.

Previously Step would step through the goroutine associated with
CurrentThread if SelectedGoroutine was parked

Previously Next would step through the goroutine associated with
CurrentThread if SelectedGoroutine was parked

Also fixes a bug with proc.(*Process).StepInto where StepInto could
switch to a different goroutine.

* tests: update to cope with go1.7 SSA compiler

* de-vendored golang.org/x/debug/dwarf

We need our own tweaked version

* dwarf/debug/dwarf: always use the entry's name attribute

Using the name attribute leads to better type names as well as fixes
inconsistencies between 1.5, 1.6 and 1.7.

* proc: Updated loadInterface to work with go1.7

go1.7 changed the internal representation of types, removing the string
field from runtime._type.
Updated loadInterface to use the new str field.

Fixes #554

* Docs: Update Documentation/cli/README.md.

For better user experience, display subcommands in alphaetic order.

This issue is fixed by go 1.7, the test will only run on newer versions
of the compiler.

Fix typo.

Fix typo.

Fix a typo.

* documentation: copied old documentation from wiki

* command: better online documentation

Help without arguments prints just a short summary for each command,
help followed by a command prints the command's syntax and a longer
explanation.

* documentation: automatically generate Documentation/cli/README.md

* proc: bugfix: StepInto can not function when temp bps exist

* terminal,service: auto-continue during next and step

Make dlv call continue automatically when a breakpoint is hit on a
different goroutine during a next or step operation.
Added API hooks to implement the other solution to this problem (cancel
the next/step operation if a different breakpoint is hit).

Fixes #387

If we are unable to correctly guess how a type is serialized in
debug_info let the user specify it directly.

Workaround for #455

While tracing delve may spend most of its time outside of
proc.(*Process).Continue, which renders
service/rpc/client.(*Client).Halt ineffective.
This commit changes the implementation of
service/rpc/client.(*Client).Halt to make it capable of stopping traces.

Our handling of SIGINT is confusing to people that expect SIGINT to be
delivered to inferior when they press ^C (see #483 for example).
Let's make an effort to point out what's happening and how one can send
SIGINT to inferior.

* Headless mode print listener address info

* if Headless && Addr == localhost:0 print address

* update listen flag changed check

* terminal: headless print API server listening address

Fixes #502

* documentation: headless invocation should specify --api-version=2

* documentation: More API documentation

* documentation: copied documentation from client.go to rpc2/server.go

Fixes #164

* service/api: Removed unused fields of service/api.Function

* proc/eval: Set return variable name to input expression

* all: fine-grained control of loadValue for better variable printing

Makes proc.(*Variable).loadValue loading parameters configurable
through one extra argument of type LoadConfig.
This interface is also exposed through the API so clients can control
how much of a variable delve should read.

* proc: add tests for command-line arguments

adds tests to make sure command-line arguments are passed to Launch() properly

* proc_windows: pass command-line arguments to CreateProcess()

build command-line arguments according to how the standard library does it and pass the command line along to the actual syscall on Windows.

see discussion in #479

* proc: better testing of cmd-line arguments

* proc_windows: fix a possible error-case with passing just 1 argument

previously, the command line pointer passed to sys.CreateProcess was empty, if we had 0 parameters (len(cmd) == 1, as cmd[0] is the executable, so no cmdlineGo would be created, while with any argument it would as len(cmd) > 1). This might cause problems down the road, so make sure we include the command line every time, even if it seems to work without.

* proc: improve testing of command-line arguments

test that arguments with spaces are passed on correctly and DRY failure/success condition checking in the args test

Issue #510

Add fallback to display colors on Windows.

New API version with better backwards compatibility plus mechanism to
select the API version that a headless instance should use.

Adds service/test/cmd/typecheckrpc.go to type check the RPC interface.