Updated icons of movers.
Revised expansion vessel for #193.
Changeg icon for #193.
Changeg icon for #193.
Updated documentation for new expansion vessel.

This is for #193. This change also corrects the image width through the css file.
Merge pull request #204 from lbl-srg/issue193_expansionVessel

Issue193 expansion vessel
Moved parameter l to base class.

This is needed for replaceable models as are used in the 3-way valve
model to work.
This is for #205.
Moved homotopyInitialization

Removed  in PartialTwoPortInterface the parameter
homotopyInitialization as it is not used in that class. Added it to
other classes that require it.
This is part of #205 revision.
Merge pull request #207 from lbl-srg/master

Merge expansion vessel to valve branch.
Removed instantiation of BaseIconLow which is not used in the Annex60 library.
Removed unrequired extends statement.