add tx -no_opt & cffwrite CFW_NO_OPTIMIZATION descriptions

[blueshade7]

Added a description of -no_opt option to tx -cff help.
Added a description of CFW_NO_OPTIMIZATION flag to cffwrite header file cffwrite.h.

[miguelsousa]

@blueshade7 do you know how -no_opt differs from +/-T optimize charstrings ?

[blueshade7]

I see in cff.c, -T sets CFW_NO_FAMILY_OPT and CFW_ENABLE_CMP_TEST, +T resets both (default).

Each description in cffwrite.h says:
CFW_NO_FAMILY_OPT Don't apply family value optimizations
CFW_ENABLE_CMP_TEST Enable testing by disabling optimizations

-/+T sets/resets T1W_ENABLE_CMP_TEST for Type1 output and its description in t1write.h says:

When bit 12 is set several optimizations are disabled so as to enable
rendering comparison tests to succeed. Do not use in production code.

There is no Type1 counterpart for CFW_NO_FAMILY_OPT.
So sounds like -T is to minimize unwanted diffs in a bit-to-bit rendering comparison of some sort. I guess “T” stands for “Test”.

The current description of -/+T seems wrong. Unrelated to charstring optimization.
I think it needs to be updated too.

[miguelsousa]

Thanks for the clarification