add pilots utils script
add chunks to symbols block
add packet_header_generator
add wifi signal header
adapt ofdm_mapper
adapt ofdm_preamble
adapt utils
adapt build
rename and update flow graphs
delete files from obsolete pilot block
flow graphs: use upstream blocks again
use upstream packet header generator again
start script: change flow graph name
flow graphs: change min output item
utils: add power measure script
utils: calc sync words
flow graphs: use packet pad2 to insert sob/eob

the preamble block did this before, but is deleted meanwhile
mapper: add maximum packet size

currently gnu radio can not handle larger tagged stream packets
update flow graphs
utils: add script to create long preamble