json: provide simple zero suppression for base64 coding
json: provide simple zero suppression for base64 coding

Leading/trailing zeros now excluded from coding - 
array anyway initialized to 0. 
Support this also in the reading. 
JSROOT code will be commited later
root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,olifre/root,karies/root,karies/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,olifre/root