re-aligned configure and configure.ac
fixed minor format glitches signaled by g95
added __XLF preprocessing option
updated documentation and Make.*, removed obsolete Make.ibm*
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@3374 c92efa57-630b-4861-b058-cf58834340f0