Fix Data Item I030/220 encoding

Rate of Climb/Descent is signed
Merge pull request #5 from bbertrand/master

Fix Data Item I030/220 encoding
Merge pull request #6 from nabilbendafi/master

Backport Ethereal 0.99.0
New contributor
v 1.0.4
Optional source address in multicast definition implemented: format is "-i m:i:p[:s]\tMulticast IP address:Interface address:Port[:Source address]"
Modified: CAT001, CAT048, CAT062
Added: CAT010
Fix cat062 definition (v1.7 and v1.16)
Merge pull request #9 from bbertrand/master

Fix cat062 definition (v1.7 and v1.16)
This is beta of version asterix version 2.0
For changes see in HISTORY
Support for Wireshark 1.10.6 (not yet finished)
XML definitions of Variable items fixed (missing fx="1" added)
Check for fx in variable implemented
Unused variables removed
Include paths fixed
XIDEF renamed to XML
Builds (without warning) and works for Linux Wireshark 1.10.6
How to build Wireshark plugin
MIssing headers added to wireshark package
Synchronous output with input file (option -s)
Looping the input file (option -o)
For Linux build "asterix" instead of "asterix.exe" is built
Filtering fixed (-LF)
Add recorded timestamp to output

- timestamp added to JSON and default output
- only implemented for final format so far
Skip DataBlock decoding when category is filtered

When a filter is applied, a data block shall be decoded only
if at least one item of the corresponding category shall be
displayed.
This improves the performances when filtering out some categories.
Merge pull request #10 from bbertrand/recorded_time

Add recorded timestamp to output
Merge pull request #12 from bbertrand/filtering

Skip DataBlock decoding when category is filtered