Config bits for master

There are four commits.

1. ItemFlags can be ignored, the substance already in master. 

2. "FanniePage with must_auth True" supports $must_authenticate being set from a config setting.  A (new) constructor was needed to do this.  It seems to work, but I'd appreciate a review of something at this level.

3. "Fannie config bit" (s/b "bits") contains changes to all of the install pages:
a. auth, for must_authenticate in #2 above.
b. Moves product options from stores to products
c. Moves FANNIE_COOP_ID from stores to necessities
d. Very little in stores now.  Added note about its vars not being widely used.
e. Moves locale options from members to necessities
f. Regularize taskbar in all Fannie and Lane Global pages using new functions in util.php
g. New src/css/install.css
h. Added explanations to lane_config/text.php
i. Does NOT code these pages as extensions of FanniePage; that's the next project.

4. "Fix util.php" removes some deadwood of mine from util.php