Add notes about compiling from CVS

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+
+Building Comedilib from CVS is slightly different from the releases.
+There is an additional step of creating the configure script and
+makefiles from the templates using automake, autoconf, etc.  This
+is all done automatically by running the script ./autogen.sh.
+
+You may need to edit the autogen.sh script so that it runs the
+appropriate commands.  Often, the necessary commands have version
+suffixes.  Occasionally, for strange reasons, errors can be
+solved by running ./autogen.sh twice.
+
+Requirements:
+
+  automake >= 1.6
+  autoconf >= 2.54
+  libtool >= 1.5
+
+