Acarsdec Versions Save

• document better compile option for raspberry in README
• undocument -v
• rtl_sdr optimization (thanks @wiedehopf )
• add skip reassembly option (@andermatt64 )
• add sublabel and mfi fields to JSON output (@andermatt64 )

Fixes:

• New thread model to fix races
• Better malloc error handling

New feature:

• MQTT output (-T -U -P options see help)