[CLEANUP] Remove unnecessary space characters.
[CLEANUP] Fix typos and spelling.
[BUGFIX] Fix render options & sections to more convenient percent values

Some of the previous values are not correct regarding Twitter Bootstraps
style of column definitions, which are divisible by 12. A few backend
editors fimilar, with Twitter Bootstrap, may not understand those
values.

Therefore small changes take place:
* 2 columns: 70-30 become 66-33 (resulting in 8-4 col.)
* 2 columns: 30-70 become 33-66 (resulting in 4-8 col.)
* 3 columns: 30-30-30 become 33-33-33 (resulting in 4-4-4 col.)
* 3 columns: 20-60-20 become 25-50-25 (resulting in 3-6-3 col.)
* 3 columns: 20-20-60 become 25-25-50 (resulting in 3-3-6 col.)
* Previous rendering sections stay for compatibility reasons
[FEATURE] Add common column options

Add following options:
* 2 columns: 75-25 (resulting in 9-3 col.)
* 2 columns: 25-75 (resulting in 9-3 col.)
* 3 columns: 50-25-25 (resulting in 6-3-3 col.)
[FEATURE] Add 6 column container

Helpful for example footer structures with many small informations, link lists, logo lines and such.