In the case where a user wishes to load a file with a name which is not of the
"standard" format (including a valid instrument), our call to the
ConfigService getInstrument method should not report an error.

A debug message is sufficient, and there is still an exception thrown which
a class user can then interpret in any way he/she sees fit.

When running mantid you know where the plugins are supposed to exist relative to
the MantidPlot executable. Just set the environment variable.

Minor fix for the default save directory being appended to the data search path mutiple times when it does not contain a slash at the end. Refs #3874

Export the access functions for the oriented lattice from the sample class. Fixes #3680. Also cleared some warnings on windows. Refs #3302

Refs #3332. Remove a function from the ConfigService that didn't belong there. It was only used in the GUI and QString already has similar functionality so use that instead.

Refs #3332 Implemented a send to options tab on the preference dialog where a user can control what programs a workspace can be sent to. Add and Edit buttons open a seperate dialog containing a form with validation to make sure the user enters the correct information.

Refs #3332 Implemented a simple send to option on the workspace context menu in MantidPlot which saves the current workspace and opens it up on another program. The menu is populated by the programs defined by the user in the properties file.  

Fixed problem with configservice not saving new entries.  Also dealt with mantid dock issue on delete 

Refs #3157 Sort our System.h. It was becoming a dumping ground. It should only be touched when absolutely necessary as it affects every file in Mantid. Also combined this with Refs #2345 to sort out DLLExport/DLLImport usage. It's done for Kernel, Geometry and API but stuff in the plugins could do with updating as well.