sqlgg and sulci-svn

Step by step:

• Move all used SQL statements to separate file: plugin_talkers.sql, plugin_seen.sql, plugin_markov.sql.
• Run sqlgg to generate code : plugin_talkers_sql.ml, plugin_seen_sql.ml, plugin_markov_sql.ml.
• Add needed support files to the source tree and modify Makefile.

Full patch against sulci_svn to enable sqlgg for plugin_talkers, plugin_seen and plugin_markov.

2009-07-30