Handle manual installations of go

src/freedombone-meshweb

 
 function install_ipfs {
   if [ ! -f /home/$MY_USERNAME/go/bin/ipfs ]; then
-      sudo apt-get -y install golang libpam0g-dev fuse
+      if [ ! -d /usr/local/go ]; then
+          sudo apt-get -y install golang
+      fi
+      sudo apt-get -y install libpam0g-dev fuse
+      if ! grep -q "GOROOT" /home/$MY_USERNAME/.bashrc; then
+          if [ -d /usr/local/go ]; then
+              echo "export GOROOT=/usr/local/go" >> /home/$MY_USERNAME/.bashrc
+          fi
+      fi
       if ! grep -q "GOPATH/bin" /home/$MY_USERNAME/.bashrc; then
           echo "export GOPATH=/home/$MY_USERNAME/go" >> /home/$MY_USERNAME/.bashrc
           echo 'export PATH="$GOPATH/bin:$PATH:";' >> /home/$MY_USERNAME/.bashrc