Because it is a budren to maintain and LGPL 2.1 does not require
them, but only suggest them:
> To apply these terms, attach the following notices to the library.
> It is **safest** to attach them to the start of each source file
> to most effectively convey the exclusion of warranty; and each
> file **should** have at least the "copyright" line and a pointer
> to where the full notice is found.
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html#SEC4
This drop a lot of non-core features code and delegate their maintainance
to third parties. Also it open the door to any missing implementation
out of the box, such as Redis for the moment.
Finally this consistently enforce a constraint where there can be one and
only one active cell at any point in time in code. This used to be true for
non-default implementation of cache, but it was not true for default
implementation where all cells were kept in-memory and thus were never
detached from their worksheet and thus were all kept functionnal at any
point in time.
This inconsistency of behavior between in-memory and off-memory could
lead to bugs when changing cache system if the end-user code was badly
written. Now end-user will never be able to write buggy code in the first
place, avoiding future headache when introducing caching.
Closes#3
Because alignment was all broken and becaues it doesn't improve much
the code readability, but potentially create more complicated diff, we
prefer to unlaign all docblocks.
