Fix issue 348 (#633)

* fix issue #348: fixed keyword EXPTIME and LST in summary fits file

* fix issue #348: fixed keyword EQUINOX and LogFileName, ScheduleName in Summary fits file

* fix issue #348: reviwed the name of the summary file, empty keyword assigned the proper dummy value

* fix isuue #348: multiple keywords in summary file are now properly valued

* fix issue #348: last fixed regarding some  keywords comment