Name: get_path - get current path from player/complete filename

Syntax:
	string get_path(string filename)

Description:
	If the filename argument is not given, get_path returns the current
	path of the player.
	
	If the filename starts with a '/' (absolute filename), it returns
	the normalized filename, that means, it resolves all occurrences of
	'../' or './'.

	If the filename doesn't start with a '/' (relative filename), it
	prepends the current path of the player to the given filename and
	returns the normalized version.

Return value: A string containing the new filename.

Examples:
	The following calls:
		this_player()->get_path();
		this_player()->get_path("/lib");
		this_player()->get_path("monster");

	could return:
		"/players/nobody"
		"/lib"
		"/players/nobody/monster"

See also: w/cd