Add emmreassembly reader setting.

Unfortunately r8441 causes too many errors for clients that do not
try to be smart (like dvbapi, see ticket #3204) so this commit reverts
r8441.

I can't see how to make non assembled and assembled emms to work both,
so I'm forced to introduce reader setting that turns off emm reassembly.

For the documentation:

emmreassembly = [0|1], Default: 1 (EMM reassembly is enabled).

emmreassembly = 0 (disable) should be set for viaccess and cryptoworks
readers if the client that you are using to send EMMs is reassembling
them instead of just sending them to OSCam for processing.

Two such clients are mgcamd and ACamd (over newcamd).

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8454 4b0bc96b-bc66-0410-9d44-ebda105a78c1