Allow disabling of node dependency installation and fix cython subscr…

…iption cleanup (#504)

* Allow disabling of node dependency installation

* Add python3-dev package (for python-config)

* Move python subscription cleanup to __del__

scripts/install-deps.sh

@@ -23,7 +23,7 @@ USE_JULIA=true
 JULIA_0_6_MODE=false
 USE_NODE=true
 USE_PYTHON_2=false
-while getopts "ijmsp" opt; do
+while getopts "ijmnsp" opt; do
     case $opt in
         i) STRICT=false ;;
         j) USE_JULIA=false ;;
@@ -59,7 +59,7 @@ PKGS+='default-jdk default-jre '
 if $USE_PYTHON_2; then
     PKGS+='python python-pip '
 else
-    PKGS+='python3 python3-pip '
+    PKGS+='python3 python3-dev python3-pip '
 fi
 PIP_PKGS+='Cython==0.29.33 '
 PIP_PKGS+='bitstruct '

zcm/python/zerocm.pyx

@@ -108,10 +108,11 @@ cdef class ZCM:
     def __dealloc__(self):
         if self.zcm == NULL:
             return
+        zcm_destroy(self.zcm)
+    def __del__(self):
         self.stop()
         while len(self.subscriptions) > 0:
             self.unsubscribe(self.subscriptions[0]);
-        zcm_destroy(self.zcm)
     def good(self):
         return self.zcm != NULL
     def strerrno(self, err):