* cygcalls.c: new, call cygwin1.dll functions directly

* cygcalls.c: new, call cygwin1.dll functions directly
* cygcalls.h: header for same
* Makefile.in: add cygcalls.[ch], remove mount/cygpath/umount
exes, fix cinstall.rc dependencies.
* path.c: remove unneeded code
* setup.c: use cygcalls instead of xcreate_process.
uncompress embedded files with zlib
add "-d" for "download only"
add "-h" for help
postpone mount changes until very end
add download progress indicators
pack multi-column listings more
auto-delete temp files
customize banner message according to options
prompt user for text/binary mounts
add warnings about empty setup directory, root installs, etc