There are no API guarantees just yet, but I *expect* that no
incompatible API changes to happen before 1.0.0.

Update NEWS.

Caught by "make check-symbols".

Shows undocumented symbols.

Caught by "make check-valgrind".

Adds check-valgrind among other modes.  We do not run under gtester by
default anymore.

We're not at 100% coverage yet, so do not enable the test by default.

The versioning is automatic.  For now, soname-major is 0.  With
the 1.0.0 release it will jump to 1 and stay there forever.

Now that vertical text works correctly, I'm doing a last round
modification of the font-funcs API to simplify.  Expect no more
changes around here.

Wow, it took me a few days to find the right fix!

We now set the advance for attached marks to zero, but we
do this in the _finish() state of gpos, so it shouldn't
regress with fonts like DejaVuSansMono that explicitly
decrease the mark advance width to set it to zero.

Starting to get there, but not without yet another round of changes.

I think I know wheere to go now.

Currently it only marks glyph origins.

The base for vertical is almost ready now.

I like this API *much* better.  Implementation still incomplete, but
horizontal works.

Design not final yet, and in fact I'm going to change it immediately,
but this is an standalone change for itself.

Apparently there exist systems with mprotect(), but not mmap()?

I'm in awe with how many bugs this test revealed.  All fixed.