Revert "[eDVBDB] avoid storing System_DVB_T_T2 in the lamedb"

This reverts commit 4407de53f54b8da95388f6ea67455d73c4133e87.
Revert "[eDVBScan] fix T->T2 fallback"

This reverts commit 90bc1f7fa28d2cf3f203ed1351d05dc28e7167c0.
Revert "[eDVBScan] fix NULL pointer segfault"

This reverts commit 0ba11f55b47f5dfea1040780f9922aecb743285f.
Revert "[scan.cpp] perform T2 and T scan only, when frontend is actually supporting DVB-T2. This will also fix USB DVB-T full service scan and tunein issues with -1 entries in lamedb"

This reverts commit 3627abe6af9d5127eb0f6f53f54699dea7d571da.
Revert "[frontend.cpp] Improve isCompatibleWith for System_DVB_T_T2"

This reverts commit 55539c7771748039d0af41c6d29174349da24e56.
Revert "frontend and frontendparms: sync fec given eDVBFrontendParametersCable"

This reverts commit a47ea90ab95f66a37c39992fee2229c6978f7115.
Revert "[eDVBScan] add sanitycheck on m_ch_current"

This reverts commit 0bfd492e1bbac82b41adae0e82728aa2ecc6d7c5.
Revert "scan both DVB-T/T2 when 'system' is not specified in terrestrial.xml"

This reverts commit e881583c790a14b04d148cd143007d0de3e2ff32.