Don't build cmtk directly in home directory

* otherwise it seems to get mixed up with package directory

Author: jefferis

build-cmtk.sh

@@ -2,6 +2,7 @@
 set -e
 # check to see if cmtk install folder is empty
 if [ ! -d "$HOME/usr/local/bin" ]; then
+  mkdir -p $HOME/src && cd $HOME/src
   git clone --depth 50 https://github.com/jefferis/cmtk
   cd cmtk/core && mkdir build && cd build && cmake .. && make DESTDIR=$HOME/ all install
 else