Add a script to update the c_content column in existing postgresql tables

Update the table creation statements for mysql to use 'mediumtext' instead of 'text' for the c_content column.
The latter is only 64k chars long, which is not enough.

Monotone-Parent: f66b516a4e4c827bd8733fd6903ca41528172989
Monotone-Revision: 36b1155b71ef197756bd93ba282a5a89126511e7

Monotone-Author: jraby@inverse.ca
Monotone-Date: 2012-01-03T20:42:34

SOPE/GDLContentStore/GCSSpecialQueries.m

@@ -258,7 +258,7 @@
   static NSString *sqlFolderFormat
     = (@"CREATE TABLE %@ (\n"
        @"  c_name VARCHAR (255) NOT NULL PRIMARY KEY,\n"
-       @"  c_content TEXT NOT NULL,\n"
+       @"  c_content MEDIUMTEXT NOT NULL,\n"
        @"  c_creationdate INT NOT NULL,\n"
        @"  c_lastmodified INT NOT NULL,\n"
        @"  c_version INT NOT NULL,\n"