DOC-590  Replace /$MANTA_USER with ~~
DOC-590 Replace MANTA_USER with MANTA_ACCOUNT
DOC-590  Add explanation of ~~ and MANTA_USER/MANTA_ACCOUNT to man files
DOC-590 Remove para abou MANTA_ACCOUNT/MANTA_USER
Merge branch 'DOC-590' Use ~~ in man page instead of MANTA_USER