SQLP 2.2.2 and SQLEP 1.7.1 Tutorial

TODO

• new control directive metagen-optional-features
• improve generated INSERT statement for not required cloumns
  • new control directive metagen-optimize-insert
  • new SQLP {= columns (...) } for INSERT
• optional features in the statement's execution scope
  • extended SqlControl
• fixed bug in pojogen-ignore-one-to-many
• improved count() SQL
• input parameters checking