rename: add --all and --last parameters

rename: add --all and --last parameters

Renaming files with rename often involves multiple passes in order
to, say, replace all spaces with underscores because traditionally
rename only replaces the first occurrence of the expression. The
--all parameter makes this task simple.

With the addition of --last, rename becomes much safer to use when
replacing file extensions, whereas before it would mangle a file
which had its extension also embedded elsewhere in its name.

The implied --first, together with --all and --last, round out the
common cases for renaming files.