made SendBuffer memory access more high level

See merge request !22

extended SendBuffer with low level memory functions

See merge request !21

Fixed a bug related improperly passing through parse_symtab call when extended U…

See merge request !18

Resolve "loadBlockData/saveBlockData not working for pe"

Closes #19

See merge request !19

Fixed a bug related improperly passing through parse_symtab call when extended USR is called recursively.

Fixed problem related to case-sensitivity of locally defined variables
Fixed problem related to compilation with latest version of clang (version 5.0.0 trunk 303036)
Minor code cleanup

move mpi stubs into walberla::mpistubs namespace

Closes #18

See merge request !17

Replaces exception thrown on getBlock with NULL

See merge request !12

Adding special documentation for modules (pe)

See merge request !14

New PE Body: Union

See merge request !4

WALBERLA_CHECK_FLOAT_EQUAL_EPSILON
WALBERLA_CHECK_FLOAT_UNEQUAL_EPSILON
WALBERLA_ASSERT_FLOAT_EQUAL_EPSILON
WALBERLA_ASSERT_FLOAT_UNEQUAL_EPSILON

Change Box to Capsule in rigidbody communication header

See merge request !13

getMaximumPenetration()
getNumberOfContacts()
getNumberOfContactsTreated()