add nicosenv to PATH before starting

asssure that PATH and therefore python venv ist the same when
starting frappy from NICOS and from commandline

base.py

@@ -24,7 +24,7 @@
 import sys
 import json
 import os
-from os.path import expanduser, basename
+from os.path import expanduser, basename, exists
 import subprocess
 import time
 import re
@@ -357,6 +357,9 @@ class ServiceManager:
                 os.chdir(start_dir)
                 if start_dir not in sys.path:
                     sys.path.insert(0, start_dir)
+                nicosenv = '/home/nicos/nicos/nicosenv/bin/'
+                if exists(nicosenv):
+                    env['PATH'] = f"{nicosenv}:{env['PATH']}"
                 if wait:
                     proc = subprocess.Popen(cmd.split(), env=env)
                     for _ in range(3):