Chrome tracing

[devinshende]

Adds support for json files as output in order to use chrome tracing as a GUI to view the tau trace files.

[nchaimov]

Although the tests are passing when run locally, for some reason, on Travis, TAU is failing to build the tau_trace2json tool:

g++   -O2 -g -I../include  -w       -DTAU_GNU -DTAU_DOT_H_LESS_HEADERS -fPIC   tau_trace2json.cpp -c 
g++   -O2 -g -I../include  -w       -DTAU_GNU -DTAU_DOT_H_LESS_HEADERS -fPIC   tau_trace2json.o -o tau_trace2json -lm -L/home/travis/taucmdr-test/system/tau/tau-2.28.1/x86_64/lib -lTAU_traceinput-e1fcdaba 
/usr/bin/ld: cannot find -lTAU_traceinput-e1fcdaba
collect2: error: ld returned 1 exit status
make[1]: *** [tau_trace2json] Error 1

We need to figure out why that's not getting built correctly in Travis.

[zbeekman]

I wonder if there is a dependency which is installed on the local system that's missing on Travis? I'll try building locally here to see if I can reproduce this.

[zbeekman]

@nchaimov what should we do with this PR? Should I merge latest unstable and try testing with GitHub actions CI?

[nchaimov]

Yeah, let's merge unstable into this branch and see if it works. It was failing due to problems building tau_trace2json but I think that was fixed in unstable with issue #342.

[codecov]

Codecov Report

Merging #324 into unstable will decrease coverage by 13.56%.
The diff coverage is 43.62%.

@@              Coverage Diff              @@
##           unstable     #324       +/-   ##
=============================================
- Coverage     66.01%   52.45%   -13.57%     
=============================================
  Files            88       92        +4     
  Lines          7286     8049      +763     
  Branches       1223     1386      +163     
=============================================
- Hits           4810     4222      -588     
- Misses         2048     3406     +1358     
+ Partials        428      421        -7     

Flag	Coverage Δ
#CI	52.45% <43.62%> (?)
#unittests	52.45% <43.62%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/taucmdr/cf/__init__.py	100.00% <ø> (ø)
packages/taucmdr/cf/objects.py	100.00% <ø> (ø)
...ckages/taucmdr/cf/software/libotf2_installation.py	87.50% <0.00%> (ø)
packages/taucmdr/cf/software/ompt_installation.py	63.15% <0.00%> (-7.44%)	⬇️
packages/taucmdr/cf/software/papi_installation.py	24.75% <0.00%> (-34.66%)	⬇️
packages/taucmdr/cf/storage/__init__.py	50.87% <0.00%> (ø)
packages/taucmdr/cf/storage/levels.py	85.00% <ø> (ø)
packages/taucmdr/cli/commands/__main__.py	29.68% <0.00%> (-2.06%)	⬇️
...kages/taucmdr/cli/commands/application/__init__.py	100.00% <ø> (ø)
packages/taucmdr/cli/commands/application/edit.py	50.00% <0.00%> (-11.30%)	⬇️
... and 117 more