fix custom button drag and drop being broken, with different strategy (1px size) to hide the drag-drop targets when not in use

Make crash in estimation code not block file load.
Diable web interface by default.

printcore - send the initial M105 using _send instead of send_now

send_now can't be used until the printer is online.

Exerimental: missing colons on if statements

Check whether printer is online when calling send()

Add optional wait timeout in milliseconds to printcore send, send_now

Fixed python-n00b error

make send_now check that the printer is online before talking to it

webinterface.py compatibility with Python 2.6 

Added web interface

PHP parser

Added a little parser for the XML status returned by pronterface.

xml format fixed