Merge branch 'dev' into 'master'

fixed memory leak problem in PetscSolverGlobalMatrix::solvePetscMatrix() if…

Closes #4

See merge request !22
12 jobs for master in 63 minutes and 37 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #4054
build:9-debug-gcc

00:17:15

passed #4056
build:9-parallel-debug-gcc

00:29:47

passed #4057
build:9-parallel-release-gcc

00:30:54

passed #4055
build:9-release-gcc

00:18:54

 
  Demo
passed #4058
demo:9-debug-gcc

00:03:20

passed #4060
demo:9-parallel-debug-gcc

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passed #4061
demo:9-parallel-release-gcc

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passed #4059
demo:9-release-gcc

00:03:24

 
  Test
passed #4062
test:9-debug-gcc

00:05:23

passed #4064
test:9-parallel-debug-gcc

00:04:52

passed #4065
test:9-parallel-release-gcc

00:05:43

passed #4063
test:9-release-gcc

00:06:50