doc: Periodic spellcheck of the documentation. * doc/interpreter/doccheck/aspell-octave.en.pws: Update Octave-specific Aspell dictionary. * doc/interpreter/contrib.txi, doc/interpreter/errors.txi, doc/interpreter/expr.txi, doc/interpreter/io.txi, doc/interpreter/preface.txi, doc/interpreter/sparse.txi, doc/interpreter/stmt.txi, doc/interpreter/strings.txi, libinterp/corefcn/qz.cc, libinterp/dldfcn/ccolamd.cc, libinterp/dldfcn/fftw.cc, libinterp/interpfcn/graphics.cc, scripts/general/structfun.m, scripts/image/ind2rgb.m, scripts/image/rgb2ind.m, scripts/io/importdata.m, scripts/linear-algebra/duplication_matrix.m, scripts/linear-algebra/housh.m, scripts/miscellaneous/mkoctfile.m, scripts/plot/comet3.m, scripts/plot/gco.m, scripts/plot/legend.m, scripts/plot/print.m, scripts/signal/fftshift.m, scripts/signal/periodogram.m, scripts/sparse/pcg.m, scripts/statistics/tests/f_test_regression.m, scripts/statistics/tests/t_test_regression.m, scripts/strings/strjoin.m, scripts/strings/strsplit.m: Correct spellings or add @nospell macro.

--- a/doc/interpreter/sparse.txi	Sun Jun 23 14:15:42 2013 -0300
+++ b/doc/interpreter/sparse.txi	Sun Jun 23 12:49:53 2013 -0700
@@ -391,7 +391,7 @@
 interconnections between nodes are represented as an adjacency
 matrix.  That is, if the i-th node in a graph is connected to the j-th
 node.  Then the ij-th node (and in the case of undirected graphs the
-ji-th node) of the sparse adjacency matrix is non-zero.  If each node
+@nospell{ji-th} node) of the sparse adjacency matrix is non-zero.  If each node
 is then associated with a set of coordinates, then the @dfn{gplot}
 command can be used to graphically display the interconnections
 between nodes.
@@ -703,7 +703,7 @@
 
 @float Figure,fig:simplechol
 @center @image{spchol,4in}
-@caption{Structure of the un-permuted Cholesky@tie{}factorization of the above matrix.}
+@caption{Structure of the unpermuted Cholesky@tie{}factorization of the above matrix.}
 @end float
 
 @float Figure,fig:simplecholperm