Better attitude filter, not sensitive to sudden accelerations
Removed unused files
Merge branch 'master' of github.com:PX4/Firmware into attitude_filter_improvement
Convert configs/olimex-lpc1766stk/nettest to use kconfig-frontends

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5555 42af7a65-404d-4744-a932-0658087f49c3
apps/examples/nettest and poll:  Complete Kconfig files

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5556 42af7a65-404d-4744-a932-0658087f49c3
Add psock_poll(); Fix some warnings reported by Lorenz Meier; lm4f logic from JP

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5557 42af7a65-404d-4744-a932-0658087f49c3
Add psock_poll(); Fix some warnings reported by Lorenz Meier; lm4f logic from JP

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5558 42af7a65-404d-4744-a932-0658087f49c3
Fix poll/select issue reported by Qiang

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5559 42af7a65-404d-4744-a932-0658087f49c3
Fix some missing logic and inconsistencies in child status logic; Fix a bug introduced into sigaction()

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5560 42af7a65-404d-4744-a932-0658087f49c3
Fix some compilation errors when child status disabled; new waitpid logic not encoding/decoding status properly

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5561 42af7a65-404d-4744-a932-0658087f49c3
Add framework to support task groups

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5562 42af7a65-404d-4744-a932-0658087f49c3
Add logic to keep track of members of a task group

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5563 42af7a65-404d-4744-a932-0658087f49c3
Add logic to send SIGCHLD to all members of a task group

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5564 42af7a65-404d-4744-a932-0658087f49c3
Move environment variables in the task group structure

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5565 42af7a65-404d-4744-a932-0658087f49c3
Don't keep the parent task's task ID in the child task's TCB.  Instead, keep the parent task group IN the child task's task group.

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5566 42af7a65-404d-4744-a932-0658087f49c3
Move file data from TCB to task group

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5567 42af7a65-404d-4744-a932-0658087f49c3
Fix a recently introduced memory leak

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5568 42af7a65-404d-4744-a932-0658087f49c3
Move stream data from TCB to task group structure.

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5569 42af7a65-404d-4744-a932-0658087f49c3
Move socket data from TCB to task group structure.

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5570 42af7a65-404d-4744-a932-0658087f49c3
Add a start hook that can be setup to call a function in the context of a new thread before the new threads main() has been called.

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5571 42af7a65-404d-4744-a932-0658087f49c3