Add SQL='string' option to EXECUTE SCRIPT.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=slony1-engine.git;a=commitdiff;h=2d0cac59824e4b9ad511244a6e3fe9863da6d69e

Modified Files
--------------
clustertest/regression/testddl/testddl.js |   19 +++++++++--
doc/adminguide/slonik_ref.sgml            |    9 ++++-
src/slonik/parser.y                       |   16 ++++++---
src/slonik/scan.l                         |    1 +
src/slonik/slonik.c                       |   52 ++++++++++++++++++++---------
src/slonik/slonik.h                       |    2 ++
6 files changed, 76 insertions(+), 23 deletions(-)