Merge pull request #1039 from siyuanh/hds

Squashed commit of the following:
WAL manager naming.
File headers.
Merge pull request #1041 from tweise/hds

Hds
Move to test.
Merge pull request #1042 from tweise/hds

Move to test.
Add separate reader.
Merge pull request #1043 from tweise/hds

Add reader.
Initial checkin for Query support from HDS.
Merge pull request #1044 from tushargosavi/hds

Initial checkin for Query support for HDS.
Remove duplicate code.
Merge pull request #1045 from tweise/hds

Remove duplicate code.
Basic fixes for range query processing.
Merge pull request #1046 from tweise/hds

Basic fixes for range query processing.
Adding HDSApplicationTest; Updating performance test with tunable blocksize
Merge pull request #1047 from sashadt/hds

Adding HDSApplicationTest
Default max data file size 128m
Merge pull request #1048 from tweise/hds

Default max data file size 128m
Include in-flight data.
Merge pull request #1049 from tweise/hds

Include in-flight data.