Documentation with Doxygen, Image1f class doc started.
Squashed commit of the following:

commit 5dad7fd649909c7ed8f856c0e7d12611aaa13b43
Author: Richard Oliver <oliver.richard@gmail.com>
Date:   Thu Jun 13 14:23:32 2013 +0100

    Start documentation of Image1f

commit cb679a0a8422a4f319cb65efafd09a4a05cedb83
Merge: 27486cd 2df4a5e
Author: Richard Oliver <oliver.richard@gmail.com>
Date:   Thu Jun 13 12:44:47 2013 +0100

    Merge branch 'master' into doxygenDoc

    Conflicts:
    	CMakeLists.txt

commit 27486cdaeb143d38e310effd13ba3e7fe23670ca
Author: Richard Oliver <oliver.richard@gmail.com>
Date:   Thu Jun 13 12:40:11 2013 +0100

    'make doc' builds basic Doxygen documentation