vtable pointer, clean up some of the redundant information in backend
with params struct

HParserBackendWithParams

compared to with strnig functions. WIP, feedback requested

better_backend_handling

but ready for review

committing now because of harddrive making a bad sound again.

cleanup

hard drive sounded bad. TODO includes free and copy updated and a bunch
of refactoring / redesign of the solution

Add ABNF-parser-derived bug60 test case, and improve some of the test macros

See merge request !45

Ticket 60 bugfix

See merge request hammer/hammer!43

"glr(1)" and call compile for the appropriate backend. Needs clean up
and refactor, and tests, but it compiles and my hard-drive is
periodically making threatening noises...

better_backend_handling

Conflicts resolved:
	src/SConscript
	src/test_suite.h

that we also check to confirm both engines have consume the same number
of tokens (and thus have actually both arrived at the same state for the
same partial input stream)

Fix uninitialized symbol warning in cfgrammar.c

See merge request !42

Fix feature macros

See merge request !41

Restore -D_POSIX_C_SOURCE=200809L in build flags on Linux; we'll figure out report of Mac OS breakage later

Using _POSIX_C_SOURCE in the middle of a header is incorrect and may work unreliably because of multiple-include guards

add regression test for issue 87 - same as issue 91

Closes #87

See merge request !37

Resolve "empty follow set assertion triggered with LALR"

Closes #92

See merge request !35

add TT_DOUBLE and TT_FLOAT as user-accessible token types

See merge request !32

Resolve "_POSIX_C_SOURCE breaks build on MacOS X"

Closes #93

See merge request !38

Resolve assertion failure with rules that can never match

Closes #83

See merge request hammer/hammer!39

fixes issue #83