Add better handling of functions for stabs debugging. It now looks for a

Add better handling of functions for stabs debugging. It now looks for a
potential function as of every bytecode, using the information provided
in revision [1147], and filtering out lables with "." or "$".
  * symrec.c: don't add symrec to bytecode unless added to table.
  * stabs-dbgfmt.c: remove old inefficient code to use new sym lookup.
  * tests/*: create first test, using a copy of elftest.asm.

svn path=/trunk/yasm/; revision=1167