Deprecate lalapps/src/lalapps/lalapps.h

In order to ease the relocation of code from LALApps to the relevant library packages, the header lalapps/src/lalapps/lalapps.h and associated code should be deprecated and removed as a dependent header for LALApps codes. The following are suggestions for how the following code might be deprecated:

• const LALStatus blank_status: search-and-replace with XLAL_INIT_DECL()
• error handlers LAL_ERR_EXIT, LAL_ERR_ABRT, LAL_ERR_RTRN, and error handler type lal_errhandler: move to lal/lib/std/LALError.[ch]
• int clear_status( LALStatus * ): not used anywhere, can be deleted
• char *XLALGetVersionString( int level ): replace with equivalent call to XLALVCSInfoString(); see lalapps/src/lalapps/lalapps.c for details
• int XLALOutputVersionString ( FILE *fp, int level ): replace with equivalent call to XLALVCSInfoString(); see lalapps/src/lalapps/lalapps.c for details.
• macro LAL_CALL() for calling LALStatus functions: move to lal/lib/std/LALError.h
• macro PRINT_VERSION for printing CVS (!!) version info: replace with call to XLALVCSInfoString()

cc @adam-mercer @duncanmmacleod @david-keitel