Migration to PHP5

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/3d6a2e1d6bf82842#

I propose we should start migrating to PHP5 one way to increase performance
and simplify code.

Here is what we should do:
1. rename all class constructors to "__construct"
2. determine what class variables and methods should be
private/public/protected (also the way, how that methods/attributes are used
by programmers should be taken into account). For example
kDBItem::FieldValues is private, but is used as public attribute.
3. Look through out the classes to determine what immediate benefit could be
gained by transforming class implementation php PHP5.

I've already created task

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