Add (undocumented) 'startswith' to <options>

Add attribute 'startswith' to <options> tag
(see lib/galaxy/tools/parameters/dynamic_options.py:416)
Add (undocumented) attribute 'display' to <inputs>

See lib/galaxy/tools/__init__.py:1531
Fix value baseurl in <param> 'type' attribute
Fix type of min and max in <validator>