Add documentation generation using Sphinx

This is deliberately modelled very closely on CMake's documentation
system.  It's a hefty patch, because it involved changing all the
documentation to be in reStructuredText format.  I also cleaned up the
copyright/license statements at the same time.

Note that the find modules contain the full license, due to the fact
that ecm_use_find_module() copies them out of the ECM distribution.

1 files changed, 8 insertions, 0 deletions

diff --git a/docs/sphinx/static/ecm.css b/docs/sphinx/static/ecm.css
new file mode 100644
index 00000000..2a326d47
--- /dev/null
+++ b/docs/sphinx/static/ecm.css
@@ -0,0 +1,8 @@
+/* Import the Sphinx theme style.  */
+@import url("default.css");
+
+/* Wrap sidebar content even within words so that long
+   document names do not escape sidebar borders.  */
+div.sphinxsidebarwrapper {
+  word-wrap: break-word;
+}