chore, zap to latest sxe-compiler.m4 package

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, import dt-strpf.[ch] from echse project

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, import wheap.[ch] from sxemacs project

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, use Edelkamp's improved weak heap variant with bulk inserts

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, bring back wheap_sort() procedure, might be useful

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'feat/cattle-tool'

* feat/cattle-tool:
  minor, bring back wheap_sort() procedure, might be useful
  minor, use Edelkamp's improved weak heap variant with bulk inserts
  minor, import wheap.[ch] from sxemacs project
  minor, import dt-strpf.[ch] from echse project