introduction of L2TauNNTag

changes done after first iteration

code-checks and code-format

removed submodule

applied 01/10 changes

implemented second iteration

added third iteration of changes

fixed the readme.md file formatting

files used are now winter2021 and debugLevel=0

fixed path dependencies

adding missing function

…release; Update recipe in README

includes general code style
safety checks
logging
removal of commented code
removal of tau_hlt namespace
update paths
switch to new HLT customization functions
use logger instead of cout

use get instead of getHandle where possible
fix typos in comments/descriptions
remove unused tokens

for a more consistent coding style

also use edm::isNotFinite