added wrappers for get_basename_nc and get_basename_offset
added wrappers for get_extension_nc and get_extension_offset
added strip_extension
use these where appropriate
remove duplicate definitions in stand-alone utilities
renamed canonize to canonicalize
added crude support for ~user -> /home/user
added win32 specific stuff in basename
added C-/ as an alias for C-_
some cosmetics, moved code
create files with mode 0644 in raw_save_buffer
untabified, removed redundant spaces
modified code generators to the same effect
