Merge branch 'topic/file_case'
* topic/file_case:
Fix double delete for file_case usage..
file_case review tweaks
soelim(1): explicit request file_case::mux_unpack
Many: use stdin support of file_case::muxer()
file_case: add support for "-" a.k.a. stdin
Preproc: use file_case::muxer() for ARGV: tbl/
Preproc: use file_case::muxer() for ARGV: refer/
Preproc: use file_case::muxer() for ARGV: preconv/
Preproc: use file_case::muxer() for ARGV: pic/..
Preproc: use file_case::muxer() for ARGV: html/
Preproc: use file_case::muxer() for ARGV: grn/
Preproc: use file_case::muxer() for ARGV: eqn/
file_case: implement direct HAVE_ZLIB layer
file_case: add read interface, extend abstraction..
file_case: support transparent file decompression..
Encapsulate searchpath:: FILE*'s in new class file_case
src/include/lib.h: add some infrastructure