Use character literals 'c' rather than string literals "c" when possible. Better performance when string constructor isn't required. * Figure.cc, __init_qt__.cc, files-dock-widget.cc, file-editor-tab.cc, file-editor.cc, octave-qscintilla.cc, main-window.cc, octave-dock-widget.cc, octave-qt-link.cc, parser.cc, webinfo.cc, resource-manager.cc, settings-dialog.cc, workspace-view.cc, __magick_read__.cc, balance.cc, debug.cc, dynamic-ld.cc, ft-text-renderer.cc, gl-render.cc, gl2ps-print.cc, graphics.cc, hook-fcn.h, input.cc, load-path.cc, load-save.cc, ls-hdf5.cc, oct-hist.cc, oct-stream.cc, pager.cc, pr-output.cc, qz.cc, symtab.cc, symtab.h, tril.cc, __delaunayn__.cc, __init_fltk__.cc, __voronoi__.cc, audioread.cc, ccolamd.cc, colamd.cc, convhulln.cc, ov-base-int.cc, ov-base-mat.cc, ov-base-scalar.cc, ov-base.cc, ov-bool-mat.cc, ov-cell.cc, ov-class.cc, ov-classdef.cc, ov-colon.cc, ov-complex.cc, ov-cx-mat.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-fcn.h, ov-flt-cx-mat.cc, ov-flt-re-mat.cc, ov-java.cc, ov-oncleanup.cc, ov-range.cc, ov-re-mat.cc, ov-re-sparse.cc, ov-str-mat.cc, ov-struct.cc, ov-usr-fcn.cc, ov.cc, octave.cc, bp-table.cc, jit-ir.cc, jit-ir.h, jit-typeinfo.cc, pt-funcall.cc, pt-idx.cc, pt-pr-code.cc, pt.h, Array.cc, CDiagMatrix.cc, CMatrix.cc, CNDArray.cc, CRowVector.cc, CSparse.cc, Range.cc, boolSparse.cc, dDiagMatrix.cc, dMatrix.cc, dNDArray.cc, dRowVector.cc, dSparse.cc, fCDiagMatrix.cc, fCMatrix.cc, fCNDArray.cc, fCRowVector.cc, fDiagMatrix.cc, fMatrix.cc, fNDArray.cc, fRowVector.cc, idx-vector.cc, intNDArray.cc, CollocWt.cc, DASPK.cc, DASRT.cc, DASSL.cc, LSODE.cc, oct-time.cc, cmd-hist.cc, kpse.cc, lo-array-errwarn.cc, lo-regexp.cc, lo-utils.cc, str-vec.cc, url-transfer.cc, main-cli.cc, main-gui.cc, mkoctfile.in.cc: Replace 1-character string literals "c" with the character literal 'c'.

--- a/libinterp/octave-value/ov-complex.cc	Fri Jul 28 11:45:07 2017 -0700
+++ b/libinterp/octave-value/ov-complex.cc	Fri Jul 28 15:40:00 2017 -0700
@@ -139,7 +139,7 @@
 octave_complex::index_vector (bool) const
 {
   std::ostringstream buf;
-  buf << scalar.real () << std::showpos << scalar.imag () << "i";
+  buf << scalar.real () << std::showpos << scalar.imag () << 'i';
   octave::complex_index_exception e (buf.str ());
 
   throw e;