Offer-motivated features: :hline defaults, ranged :hpos, @date :days, :bottom none

- @table: a writer's :hline/:vline replaces the default lines; new
  boundary name 'none' removes all lines
- @table: ranged :hpos argument overrides :cell_hpos per cell
  (\multicolumn{1} in tex; positions a colspan anchor's merged cell)
- @date/@datetime: :days offset argument (sks/date/date.py)
- @document: ":bottom none" suppresses the footer (\pagestyle{empty})

Also carries the escape-system generator/renderer fixes, per-cell-range
:format, and uppercase .TTF/.OTF font recognition from klammertext-dev.

mac/eval.cpp

@@ -6,6 +6,7 @@
 #include "show.h"
 #include "katom.h"
 #include "file.h"
+#include <algorithm>
 #include <unistd.h>
 
 std::string shell(State state, std::string command, Locator loc)
@@ -151,8 +152,19 @@ katom_list Eval::eval(katom_iter begin, katom_iter end)
     }
     katom_list result {};
     Machine M = m_machine;
+    size_t before = M.m_katoms.size();
     M.read(eval_result);
-    M.apply(M.m_state.value("K_target"), false, false);
+    // If the @eval produced more Klammertext -- the read-back result still
+    // holds klammers to reduce (a "generator", e.g. a Python klammer returning
+    // a @table call with data) -- then its text is writer content: escape it
+    // for the target before applying, exactly as typed input is escaped, so a
+    // "%" in the data becomes "\%".  If it produced final target markup (no
+    // klammers left, a "renderer" such as @table itself emitting \begin{tabular})
+    // leave it untouched.  ^'...'^ literal spans are skipped by the escape pass,
+    // so a generator can still carry raw target markup.
+    bool has_klammer = std::any_of(
+        M.m_katoms.begin() + before, M.m_katoms.end(), begin_apply);
+    M.apply(M.m_state.value("K_target"), false, has_klammer);
     result = trim(M.m_katoms);
     return result;
 }