minor, dispatch to intrinsic or routinic popcnt

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, use a prefix-tree-like cache for first and second character in pattern strings ...

... starting with [a-z].

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, provide -c|--count in standard glep(1)

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, provide regressions for the -c|--count feature

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

* tool/glep:
  test, provide regressions for the -c|--count feature
  minor, provide -c|--count in standard glep(1)
  minor, use a prefix-tree-like cache for first and second character in pattern strings ...
  minor, dispatch to intrinsic or routinic popcnt