Simul efun: ladjust - make string with a fixed length

Synopsis:
	string ladjust(string str, int length)

Description:
	Makes a string <length> characters long, either by truncating it
	if it is too long, or by filling it up with spaces if it's too short.

Return value:
	returns a string of the fixed length 'length'

Examples:
	ladjust("12345", 10) returns "12345     "
	ladjust("1234567890", 5) returns "12345"

See also: efun/sprintf, efun/extract