WIP: changes from fredvd and datakurre improvements.

[rnixx]

Keep track of changes and improvements made by @fredvd and @datakurre.

[rnixx]

This PR should be rebased to master and only implement search_attrlist improvement. Then we can merge

[fredvd]

@rnixx What's the issue with the things that were fixed, not to merge them?

[rnixx]

@fredvd What fixes are left there except the query normalization?

UPDATE Let me say it from the other direction. All the encode/docode changes can be dropped due to behavioral changes in python-ldap. Query normalization in node and ugm shoud stay.

[mauritsvanrees]

As known, this PR is outdated, and cannot be merged in this condition.
I have created a branch https://github.com/zestsoftware/node.ext.ldap/tree/fixes-from-datakurre-and-zest with these changes, so we know the state in which this PR was left. It is the same as the datakurre/master branch.

I will sync our master branch with the original bluedynamics one, and create a fresh branch for Fred's fix 43cc656.

You can close this PR, I will create a new one.