Remove obsoleted string-to-int, string-to-seqence, insert-string calls.

Emacs 22.1 obsoleted these functions:
  string-to-int is now string-to-number
  string-to-sequence for a list is now string-to-list
  insert-string is now insert

Note that only the insert-string => insert changes outcomes. The
original function expanded integer args into strings, the new
one does not. However the use of insert-string in the jdb interface
should not be affected by this (besides, it is used only to
debug the debugger!).

git-svn-id: https://jdee.svn.sourceforge.net/svnroot/jdee/trunk@275 381a1f10-3442-0410-997e-ef331cd04102