First round of indexing improvements.
Merge branch 'gawk-4.1-stable'
Some new helper files added.
Add memory allocation functions to gawk API.
Merge branch 'gawk-4.1-stable' of ssh://git.sv.gnu.org/srv/git/gawk into gawk-4.1-stable
Update doc on API memory allocation, add to NEWS.
Merge branch 'gawk-4.1-stable'