maint: Octave coding convention cleanups. * Figure.cc, QtHandlesUtils.cc, files-dock-widget.cc, find-files-dialog.cc, debug.cc, ls-hdf5.h, oct-fstrm.h, oct-iostrm.h, oct-stdstrm.h, oct-stream.h, pr-output.cc, sysdep.cc, zfstream.h, pt-cbinop.cc, f77-fcn.h, DASPK.cc, DASSL.cc, cmd-hist.cc, glob-match.h: Cuddle angle bracket '<' next to C++ cast operator. Space between variable reference and variable name (int& a). Space between bitwise operators and their operands (A & B). Create typedef tree_expression_ptr_t to avoid "tree_expression *&a" which is unclear.

--- a/libinterp/corefcn/pr-output.cc	Mon May 02 11:12:16 2016 -0700
+++ b/libinterp/corefcn/pr-output.cc	Mon May 02 11:13:50 2016 -0700
@@ -1662,7 +1662,7 @@
 
       os << "  "
          << std::setw (8) << std::setprecision (1)
-         << std::setiosflags (std::ios::scientific|std::ios::left)
+         << std::setiosflags (std::ios::scientific | std::ios::left)
          << scale
          << " *\n";