Consistently use 'filename' rather than 'file name' throughout code base. * bootstrap, configure.ac, basics.txi, gui.txi, io.txi, mkoctfile.1, __init_qt__.cc, dialog.cc, files-dock-widget.cc, find-files-dialog.cc, file-editor-tab.cc, file-editor-tab.h, file-editor.cc, shortcut-manager.cc, debug.cc, dirfns.cc, dlmread.cc, file-io.cc, input.cc, load-path.h, load-save.cc, symtab.h, sysdep.cc, utils.cc, variables.cc, zfstream.h, oct-parse.in.yy, dir-ops.cc, file-ops.h, cmd-hist.cc, cmd-hist.h, octave_tmp_file_name.m, uigetfile.m, uiputfile.m, imshow.m, imageIO.m, dlmwrite.m, importdata.m, copyfile.m, edit.m, mkoctfile.m, movefile.m, open.m, perl.m, python.m, run.m, tmpnam.m, unpack.m, fminsearch.m, configure_make.m, print.m, __print_parse_opts__.m, test.m, main.in.cc, mkoctfile.in.cc, module.mk: Consistently use 'filename' rather than 'file name' throughout code base.

--- a/configure.ac	Wed Nov 18 15:44:33 2015 -0500
+++ b/configure.ac	Wed Nov 18 15:48:27 2015 -0800
@@ -2693,7 +2693,7 @@
     ;;
   esac
 
-  ## Determine which library file name to search for.
+  ## Determine which library filename to search for.
   case $host_os in
     darwin*)
       jvmlib=libjvm.dylib