0.2: Data handling complete

Added formatting functions: format() and dtosf() for RLIB compatibility.
Added Swiss army knife formatting function printf().
fxpval() now accepts a number as the first argument.
Removed a debugging line from datetime handling.

0.1: Data handling almost complete

• Expression parsing and grammar with Flex/Bison
• Datasource handling complete: memory arrays, CSV, JSON, XML, PostgreSQL, MariaDB and ODBC input
• Precalculated variables and delayed expressions are implemented
• Almost every RLIB functions are implemented. The missing functions are dtosf() and format().
• Extra functions and operators not existing in RLIB
• Initial documentation
• Unit tests

There is no layout and output driver so it's not useful for end users yet.