Segregation of standard output and standard error streams at Web UI level

[ghansham]

Dear Sir

Kindly create two separate links for viewing standard output and standard error streams of dag processes. We can also make the error code returned as a link and redirect user ro stderr stream and user can go to stdout lmstream from existing link.
Another improvement, we suggest is to give provision to the user to utilize params in the dag to form the log filenames for stdout and err if specified.

Regardd
Ghansham