add some new, easier achievements

Introduce eight achievements that can be attained by more players.
 Entered Gnomish Mines  - self explanatory
 Entered Mine Town      - the town portion, not just the level
 Entered a shop         - any tended shop on any level
 Entered a temple       - likewise for temple
 Consulted the Oracle   - bought at least one major or minor oracle
 Read a Discworld Novel - read at least one passage
 Entered Sokoban        - like mines
 Entered the Big Room   - not always possible since not always present

The novel and bigroom ones aren't always achieveable since novels are
only guaranteed if a book or scroll shop gets created and bigroom is
only guaranteed in wizard mode.  No one ever claimed that every
possible achievement can be attained in a single game.  (If one for
entering the Fort Ludios level--or perhaps entering the Fort itself--
eventually gets add, that won't be possible in every game either.)

The mine town one probably needs some tweaking.  Two of the town's
seven variants have no town boundary (despite a rectangular area of
pre-defined map) and at present simply arriving on either of those
levels is enough to be credited with the entered-town achievement.

Bump EDITLEVEL because u.uachieved[] has increased in size.  This
time it has been expanded to the maximum that xlogfile's bitmask of
achievements can handle, enough for up to 9 more achievements without
another EDITLEVEL increment.

doc/Guidebook.tex

@@ -2855,8 +2855,9 @@ heavy.  It is rumored that some statues are not what they seem.
 
 %.pg
 Boulders occasionally block your path.
-You can push one forward when nothing blocks {\it its\/} path, or you can
-smash it into a pile of small rocks with breaking magic or a pick-exe.
+You can push one forward (by attempting to walk onto its spot)
+when nothing blocks {\it its\/} path, or you can
+smash it into a pile of small rocks with breaking magic or a pick-axe.
 Very large humanoids (giants and their ilk) have been known to pick up
 boulders and use them as missile weapons.
 
@@ -3058,8 +3059,24 @@ in which you might accomplish them.
 \settowidth{\achwidth}{\tt Mines'~End~}
 \addtolength{\achwidth}{\labelsep}
 \blist{\leftmargin \achwidth \topsep 1mm \itemsep 0mm}
-%.PL Sokoban
+%.PL Shop
+\item[{\tt Shop}]
+Entered a shop.
+\item[{\tt Temple}]
+Entered a temple.
+\item[{\tt Mines}]
+Entered the Gnomish Mines.
+\item[{\tt Town}]
+Entered Mine Town.
+\item[{\tt Oracle}]
+Consulted the Oracle of Delphi.
+\item[{\tt Novel}]
+Read a passage from a Discworld Novel.
 \item[{\tt Sokoban}]
+Entered Sokoban.
+\item[{\tt "Big~Room"}]
+Entered the Big Room.
+\item[{\tt "Soko-Prize"}]
 Explored to the top of Sokoban and found a special item there.
 \item[{\tt Mines'~End}]
 Explored to the bottom of the Gnomish Mines and found a special item there.