CWEB — release 4.8

This new release provides the following features

• @<Code sections@> can be used freely in any #if–#elif–#else–#endif preprocessor branches without bashing the debugger
• the gcc compiler can be invoked with option -Wimplicit-fallthrough=2 and will acknowledge /* fall through */ comments in the tangled C code
• simple C casts like “(double) x” are formatted with non-breaking small spaces as (double)\,x in the woven TeX output
• the HINT boolean macros are now in lowercase

and fixes

• section @<Preprocessor definitions@> isn't overprinted (in PDF)
• issues #33, #34, #36, and #37

Known bug:

• issue #38