Version 2.0 Added Co-supervisor

Added \cosupervisor field.
- Needs to be turned on with cosupervisor option in preamble

- Same syntax and usage as supervisor

- Added a horizontal and vertical mode for the co-supervisor action.
Horizontal mode activated with horizontal option in the preamble.

Created copies of the title page and declaration for inclusion in the
documentation:

Title page
- other
- report
- fullsubject
- partialsubject
- honours
- mastersbycoursework
- mastersbyresearch
- phd
- phd a5
- phd noschool
- phd nosupervisor
- phd nosupervisor noschool
- phd cosupervisor
- phd cosupervisor horizontal

Declaration
- report
- fullsubject
- honours
- phd