[Squirrel-sql-develop] Latest changes

[Colin B. <col...@bi...>]

- The squirrel-sql.jar file is now executable.
- Function and keyword lists moved out of the main metadata tab and
  placed in their own tabs (David MacLean).
- The DATA_TYPE column in the metadata tab now has a descriptive entry
  as well as the numeric code (David MacLean).
- Now shows catalogs in object tree for more DBMS's.
- Can now select the current catalog via a dropdown for those DBMS's
  that support catalogs.
- Now shows table hierarchies if the JDBC driver supports them (Henner
Zeller).

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I'm currently working on the object tree. The functionality I'm adding
includes context sensitive popup menus (including the ability for plugins to
add items), ability for plugins to add new object types, add information to
existing object types etc.

Col