optimize collider

Registered by Bruno Chareyre

Following https://bugs.launchpad.net/yade/+bug/729079
An optimized colliding algorithm has been commited to branch lp:~bruno-chareyre/yade/collide.
I couldn't find any problem in this and nobody reported problem (but maybe nobody tried).

Suggested merging of the branch with trunk, the result will be:
- new behaviour by default (x2 speedup measured on 200k spheres, more speedup expected on larger problems)
- old behaviour still available unmodified at run time
- compiling (most of) the old version still possible by #undef ORI_VERLET,

Some code cleaning, old code removal, default tuning, can be done after a period in trunk, if no problem will be reported.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Bruno Chareyre
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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