urls: allow pathnames to convert >url.
Change "3dup drop" to "2over".
io.pathnames: remove file-directory (redundant to parent-directory).
tools.completion: don't use file-directory.
math.primes.erato: minor performance improvements.
benchmark.udp-echo0: "over over" is just "2dup".
change some "2drop 2drop" to "4drop".
hashtables: use "4drop" instead of "drop 3drop".
io.random: adding a "random-line" word.
io.random: rename to "random-readln".
sequences.extras: implement "insert-nth!".
io.random: cleanup using "each-numbered-line", implement "random-lines".
Add glDrawElementsBaseVertex
io.random: Fix off-by-one error.
opengl.gl: cleanup formatting.
io.random: much faster version of random-lines for large n.
io.random: bit faster using set-nth-unsafe.
unix.ffi: adding fileno.
xml.syntax: Nested xml literals were not handled correctly.
terminal: adding "terminal-size" vocab.