The ansi target, txt table styles, kdesc reference from ref/, typeface and table-width fixes (from dev fcec5e2e77ac)

Since the previous release: Machine::read_string() (the fs::path/std::string
overload pair split); kdesc -c and -u rendered from the ref/ reflection
klammerset; a fit column's tex width measured in TeX over every entry;
@typeface resolving to the family its css declares (a store directory name
now works in html) and hieroglyphs in @unicode_examples set in their
typeface; the ansi target -- plain text with the type styles a terminal can
show, identical to txt once the escape sequences are stripped -- with the
txt @table carrying :header_style, :style and :hline; @block anchoring,
@table spacing and the Image_quality state variable; and the rewritten
doc/klammertext_for_llm.md.

sks/kutil/klammer_base.py

@@ -67,16 +67,25 @@ class Klammer_base:
             print(label)
         pprint.pprint(self.__dict__)
 
+    # A target that :includes another renders through the included one's
+    # method: pdf is tex compiled, ansi is txt with escape sequences.  The
+    # Python side cannot see :includes, so the relation is restated here.
+    # SYNC: the @@@target declarations in sks/target/target.k.
+    TARGET_METHOD = {"html": "html",
+                     "tex": "tex", "pdf": "tex",
+                     "txt": "txt", "ansi": "txt"}
+
     def __str__(self):
         result = None
-        if self.K_target == 'html':
+        method = Klammer_base.TARGET_METHOD.get(self.K_target)
+        if method == 'html':
             result = self.html()
-        elif self.K_target in {'tex', 'pdf'}:
+        elif method == 'tex':
             result = kutil.escape(self.tex())
-        elif self.K_target == 'txt':
+        elif method == 'txt':
             result = self.txt()
         if result is None:
-            #print(self.__dict__)
             raise Exception(
-                f'Target "{self.K_target}" is undefined for klammer "@{self.K_klammer}"')
+                f'Target "{self.K_target}" is undefined for klammer class '
+                f'"{self.__class__.__name__}"')
         return result