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(paths): Redefine as type pathlike. (display_error): Declare a few different ways to allow more flexible usage throughout. (display_error_fmt): New function for those cases where C++ just isn't enough. (add_path): Rewrite to allocate pathlike paths. Always tack on a trailing slash since that's what everyone who uses it wants. NULL terminate the path list. Register "it's a system path" field. (init_path): Call add_path with info regarding whether path is a system path or not. (pathlike::check_existence): Move into pathlike class. Accept file and extension arguments to build up path on the fly. Modify other arguments. (find_on_path): Constify return value and appropriate arguments. Eliminate short-circuit for fully-qualified paths. Simplify loop which iterates over path. (already_did): Constify argument. (track_down): Ditto. Regularize some error messages. (find_app_on_path): Ditto. (cygcheck): Constify argument. Use 20th century string handling functions. (dump_sysinfo): Remove odd inclusion of '\\bin' "Just in case". Accommodate change of paths to pathlike. * path.cc (isslash): Rename from SLASH_P and use throughout. (rel_vconcat): Front-end to vconcat which prepends cwd to path before passing along for conversion to native windows. (cygpath): Remove "./" test. Call rel_vconcat if filename appears to be relative.
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