Updated parse2 to use node-shared AppendableVecs when parsing csv.
1) Updated parse2 to use node-shared AppendableVecs when parsing csv.
2) Added flag to MRTask to force it going single threaded.
3) Changed single-threaded execution in MRTask to work with forked task finished via completers (so that it continues execution of right subtree only after left subtree has truly finished - i.e. including forked off tasks connected via counted completeres)
4) added exec method to MRTask2, which is similar to asyncExec, except it will do single threaded work in the same thread(must be called from within FJ thread).
MRTask fix. Added back missing call to compute right subtree.
Fix in parse. Added missing completer link in MultifileParseTask.
Fix in MRTask: when going single threaded, fork instead of calling compute directly to prevent stack overflow.
Merge branch 'parse_mem' of https://github.com/0xdata/h2o