Add source rtc call to specify specific "patterns"

Now:

 aa=gdat(82532,'rtc'); gives 'source',{'Actuator_state','plasma_state','samone_out'} by default, allows specific patterns to be chosen

 aa=gdat(82532,'rtc','source',''); % to get all scd_mems 

assigned to @pastore

added 87 commits

• 7d6a9d1b...92bf0a76 - 86 commits from branch master
• 59f7cea7 - Merge branch 'master' into add_source_rtc_call

Compare with previous version

aa = gdat(82532,'rtc','source','rapdens') works as expected, retrieving the structures RAPDENSin and RAPDENSout from RTC nodes

approved this merge request

merged