maint: More cleanup of C++ code to follow Octave coding conventions. * gl-select.cc, betainc.cc, bitfcns.cc, bsxfun.cc, gl-render.cc, graphics.cc, load-save.cc, ls-mat-ascii.cc, ls-mat5.cc, lu.cc, oct-stream.cc, symtab.cc, variables.cc, __eigs__.cc, __magick_read__.cc, chol.cc, ov-base-sparse.cc, ov-class.cc, ov-classdef.cc, ov-fcn-inline.cc, ov-perm.cc, ov.cc, CMatrix.cc, CSparse.cc, MSparse.cc, MatrixType.cc, MatrixType.h, dMatrix.cc, dSparse.cc, fCMatrix.cc, fMatrix.cc, eigs-base.cc, lo-sysdep.cc, kpse.cc: Break long lines before && and ||.