Modify assemble:prepare templates for using by assemble only.

assemble/.calculate_directory

@@ -1 +1 @@
-# Calculate append=skip cl_name==calculate-install
+# Calculate append=skip cl_name==calculate-assemble

assemble/prepare/etc/make.conf

@@ -1,6 +1,8 @@
 # Calculate
 ACCEPT_LICENSE="*"
+#?pkg(app-portage/layman)!=#
 source /var/lib/layman/make.conf
+#pkg#
 MAKEOPTS="#-os_install_makeopts-#"
 EMERGE_DEFAULT_OPTS="--jobs=4"