Doc updates to sphinxsearch on Google Code

Changed Paths:
    Modify    /trunk/doc/sphinx.xml
    Modify    /trunk/src/llsphinxql.c
    Modify    /trunk/src/searchd.cpp
    Modify    /trunk/src/sphinxql.l
    Modify    /trunk/src/sphinxql.y
    Modify    /trunk/src/yysphinxql.c
    Modify    /trunk/src/yysphinxql.h

added secure_connection flag to MySQL protocol; added dummy SHOW VARIABLES, SHOW COLLATION, and SET character_set_results support (MySQL.NET connector should now work)