Create 'program distribution' mechanism

[dakusui]

Instead of moving aroung data, transmitting a processing program is an approach of map reduce.
The processing program bashreduce is relying on is essentially a bash one liner.
But quoting/escaping hell is really painful. (just running simple sed/awk commands isn't comfortable enough)

Somehow a program distribution mechanism desirable.

Basic idea is

1. Create a wrapper script. This will distribute the entire bashr pipeline definition.
2. A pipeline definition will contain
   1. aliases or functions which define map/reduce tasks used in the pipeline
   2. how they are connected
   3. (etc, if necessary)
3. The wrapper script execute map/reduce tasks as defined in the pipeline. In this step the wrapper script and br script will issue ssh command. And they will orchestrate so that the aliases/functions become available before actual execution of the task.

[dakusui]

Since I could come up with a way to make the quoted one liners used in bred consistent (-I option), closing.
Program distribution would become necessary sooner or later, but it's a separate issue.