First steps toward MS SQL compatibility.
Some more initial steps towards MS SQL support.
Refactor the SQLite source files.
Some more SQL Server support (schema conversion).

Converting the table definitions (with type casting) seems to work. Also
did experiment a little with actuallt fetching some data... and had to
edit the cl-mssql driver, which is temporarily monkey patched.
Force package names to be read in the KEYWORD package.
Implement data transfer from SQL Server.
Fix MS SQL convertion of money to numeric.
Refactor the command parser.

Split its content into separate files, so that each is easier to
maintain, and to make it easier also to add support for new sources.
Add a new database source type in the parser.

Now it's possible to parse a command to load data from MS SQL. The
parser was until now parsing all database URI within the same common
rule and that isn't possible anymore if we want to distinguish in
between source database right from the parser, which we actually want to
do.

This patch also implement in-passing fixes all over the place, including
the transformation function float-to-string that only happened to work
on double-float data.