draw rounded rect. as a simple rect.

This is not to lose data. Should be fixed later.

Change-Id: Ic763db278f55fbc14a1c358430375ca9ba67ed09
approximate callouts

Change-Id: I9d823a749350a62a0fe972034b82210399a15c7f
connectors do not have any text

Change-Id: I9350126163a97b2b7f679b205f2730bcf3ff87dd
prepare for a release

Change-Id: I13e0e1fe1eaf0cf00bb9fd768cf36b67c53dfd2a