Filter out ecm to reduce number of not founds

= Reason for enhancement <improve efficiency by blocking out incompatible ecms. After filtering out incompatible CHIDS and ecm len and headers, some ecms which already meet len and header criteria sometimes yield not founds and sometimes founds as well at a huge ratio of 50% found and 50% not found.

2014/09/25 12:20:35.987 [C.newcam 002] oscam0 (0604&00|A00080|0000@0068|061/58040647): not found (1158 ms) 2014/09/25 12:20:36.574 [C.newcam 003] oscam1 (0604&00|A00080|0000@0068|061/58040647): found (396 ms) by reader-1 2014/09/25 12:20:36.944 [C.newcam 001] oscam2 (0604&00|A00080|0000@0068|05C/F42C710C): found (379 ms) by reader-2 2014/09/25 12:20:40.146 [C.newcam 003] oscam1 (0604&00|A00080|0000@0068|05C/5EAF56D7): not found (539 ms) 2014/09/25 12:20:40.727 [C.newcam 001] oscam2 (0604&00|A00080|0000@0068|05C/5EAF56D7): not found (385 ms) 2014/09/25 12:20:43.074 [C.newcam 002] oscam0 (0604&00|A00080|0000@0068|05C/E4112DE7): found (628 ms) by reader-0 2014/09/25 12:20:44.851 [C.newcam 002] oscam0 (0604&00|A00080|0000@0068|061/EE832A49): not found (1925 ms) 2014/09/25 12:20:45.500 [C.newcam 001] oscam2 (0604&00|A00080|0000@0068|05C/5689FADB): not found (1494 ms) 2014/09/25 12:20:46.058 [C.newcam 003] oscam1 (0604&00|A00080|0000@0068|061/EE832A49): found (1034 ms) by reader-1

= Possible impacts on other features