Build/packaging changes for installer

Preparation for packaging installer separately from trafodion.
- Makefile comments describe new versioning scheme for installer.
- Change tar file suffix to one that IE browser will accept.
- Remove the execute permission modification, since it was changing
  license files, and all scripts are already executable in git.
- Add clean target.

Change-Id: I0861a30d4555950ef7fe48c2eb9c8cacefdda4fa