This reverts commit 3b5e03df.

The now() intrinsic was replaced with a current_time() intrinsic which returns the current time (not head block time) in microseconds since epoch.

A now() function was defined in eosiolib/system.h which returns current_time()/1000000 so that existing contracts which use now() need minimal changes.

The publication_time() intrinsic was modified to also return the time as microseconds since epoch.
The only contracts that used publication_time() so far were for tests and those tests have been updated to reflect the new meaning of publication_time() and current_time().

add back current_receiver intrinsic and use it to provide a quick fix to multi_index bug (until the better solution is implemented for RC2)

The multi_index bug was that attempts to use multi_index to create/modify/erase table rows of accounts other than the current receiver would not fail as it should and would instead likely unintentionally trample over data in the current receiver's tables.

Add missing tests

issue #1754

Rename action_size to action_data_size.

update doxygen setting to enable processing PACKED macro

update account api documentation

fix account cpp ingroup

update chain c api doc

update db api

update console api

update homepage

update fixedpoint

update fixedpoint api doc

update real api doc

update transactions docs

update types and varint docs

updated doxygen main page

fix problem with db api docs

fix message uncapitalized letter

(cherry picked from commit 8c79f757)

added tests for the WASM currency contract and fixed issues it exposed, refactored contract initialization as a require_recipient where the logic of init vs apply is now in the wasm_interface

begin restoring the test_api contract interface, pull results out of the apply_context into chain controller

Added test for basic wasm contract loading/unloading.  Fixed bugs in the intrinsic code and made it impossible to complile with the same class of bugs in the future.  Did some basic style/renaming in the contracts directory and in the enclosed tutorial/doxygen files