remove misleading/outdated comments
add LENGTH_FMT for size_t/Length printing

perhaps this should not exist, and we should use %zd directly,
since format.c supports it.
remove LongDouble, and assume long double support

Also, remove all the "doesn't have long double" defines in
cconfig.h. We'll deal with that if we ever come across platforms
that don't support it.

closes #100
MSVC 2012 does not support %zd format modifier
prevent dangling else for uses of assert

Also, move the check for _dont_assert into _do_assert.
Having a runtime variable decide whether an assert is fatal
makes static analysers misbehave. They are right about potential
undefined behaviour after a failed assert, but should not know this.
remove unused variables; add -1 as a value to gjId

Adding an explicit GJ_INVALID means we don't need to rely
on conversion to integer.
correct the type of gcTimer

Also:
- Use standard C preprocessing operators # and ## instead of
  Enstring and Abut. We can assume these exist by now.
- fintphase.h had a broken header guard. Most files also have
  standard-violating header guards (they start with _ followed
  by a capital letter).
rename fintState in foam_c.c to fiState

foam_c is not the interpreter
use LENGTH_FMT where appropriate
export special character table from genc.c

gencpp needs it, and redundantly re-declared it, risking violation of
the one-definition-rule.

Also:
- rename emptyEnv in genc.c to gc0EmptyEnv
- rename emptyEnv in genlisp.c to gl0EmptyEnv
- int0 is not a pointer, don't use it where a pointer is expected
add missing include
remove unused variables
correct type of hfoldUnit implementation
rename of_inlin's ProgInfo to InlProgInfo

To prevent confusion with fint's ProgInfo
inlutil has its own inuProgInfo, so I think this makes sense.
fix warning about operator precedence
prefix local definitions with a namespace
wrap SIntReduce test in IF_LongOver32Bits
use LENGTH_FMT
remove redefinition of TmTimer, and include timer.h
declare YYSTYPE only once to prevent ODR violation