Path - Path handling routines
-----------------------------

This module implements common routines for dealing with paths.

Functions
~~~~~~~~~

`is_abspath()`::

    Returns a non zero value if 'path' is an absolute path. zero otherwise.

`is_file()`::

    Returns a non zero value if 'path' is a regular file. zero otherwise.

`is_dir()`::

    Returns a non zero value if 'path' is a directory. zero otherwise.
    
`path_normalize`::

Returns a string that contains the normalized full path specified by 'base', 'name' and 'dir'. +
The function performs this type of checks/manipulation:
+
--
    * If the first character in 'base' is "~" it is expanded to the users home directory.
    * Sequences of delimiters are replaced with one delimiter.
    * Makes sure 'base' is an absolute path.
    * 'name' must not contain an delimiter.
    * terminates the string with an delimiter if 'dir' is non-zero.
--
+
Returns `NULL` if 'base' is not an absolute path or 'name' contains a delimiter.