Dev fix: Wasn't correctly creating the element to insert a header row
Dev: Remove asDataSearch - its gone now
Build latest changes
New: columns().nodes() and column().nodes() methods

- Previously there was columns().cells() and column().cells(), but these
  were removed in f0a73ce due to the changes for the new top level
  cell() and cells() selector methods.

- This commit effectively re-instates those functions but under the
  `nodes()` name, matching the row and cell selection options. This is
  for completeness in the API.
Merge branch '1_10_wip' of github.com:DataTables/DataTables into 1_10_wip