qubespolicy: plug GUI code into qrexec-policy tool
qubespolicy: plug GUI code into qrexec-policy tool

Fixes QubesOS/qubes-issues#910

woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin