Merge pull request #1 from MuMech/dev

rebase to mumech/dev
new info item: total intakeair available

An item I've sometimes wanted, and which tavert refered to in #52, how
do we know how much air we have left?  This patch adds the ability to
know how much airflow we'd have if we opened all intakes.
fix issue #52: recursive symmetry screws up intake mgmt

Intake management opens symmetric groups of intakes.

However, the data model I rely on screws up when you recursively attach
a symmetric group.  E.g. make a fuselage, attach a symmetric pair of
intakes on cubes.  Save it as a sub-assembly.  Now add the sub-assembly
with symmetry on a bicoupler.  There are four intakes ABCD; A has as
symmetryCounterparts B and C.  D has as symmetryCounterparts A and B.
So when you open the first group of intakes, you get ABC opened.  Maybe
that's enough air, so you close the second group, which closes ABD.
You're left with just C open, which is not enough air.

Solution: compute groups via the transitive closure.  So this makes one
group ABCD, which is open or closed.
Added support for selective module unlocking for Career mode
Added MJ2 Pod
Preparing 2.1 release
Remove the commented block in MJ2 Pod

It crash Module Manager
Minor fix

- Docking Force roll now consistant with ASAS TGT+ force roll
- Attitude PID lastAct get reset onStart ( since
onFlightStartAtLaunchPad does not exist in MJ )
- Minor fix for parachute sim
Current Biome info item

Final version of the code I pushed earlier by error...
Biome info more fix
Conti interstellar mod support for dV calculation
NathanKell : Add support for MFS thrust correction
Merge pull request #217 from numerobis/numerobis-issue-52

Fix issue #52: recursive symmetry breaks intake management
Redo Conti Interstallar Suuport without ressource name

All ressource with a density of 0 are renewable
IntakeAir support for dV
Hide Display module that are not researched yet
Take into account engine rotation (numerobis)

Engine that are not alligned with the ship provide less thrust. This
patch fix MJ to know that
A new toggle change the display for the dV simulation
numerobis provided the VesselState Part
I did the fuel simulation part
Revert "Hide Display module that are not researched yet"

This reverts commit b969d6d339a8e2e3ebba20faad68a146c68bd0c8.
Proper fix for disabled module windows
Merge branch 'dev' of https://github.com/MuMech/MechJeb2 into dev