h5edit

Post release v1.2.0 cleanup/reset.
Changed release version information to v1.2.0-post0.

Revamped how version information is printed for option --version.
i) change bin/setversion to produce H5EDIT_VER_INFO in h5edit.h;
ii) Changed print_version in misc.c to use H5EDIT_VER_INFO to display version information.