Allow more char's in breaktable names

documentation/RELEASE_NOTES.md

@@ -16,6 +16,14 @@ should also be read to understand what has changed since earlier releases.
 
 <!-- Insert new items immediately below here ... -->
 
+
+### Breakpoint Table Names
+
+The names of breakpoint tables were made unnecessarily strict when DBD file
+processing was moved to Perl for the 3.15 release series. Table names may now
+contain the special characters `_` `-` `:` `;` `.` `[` `]` `<` `>` in addition
+to letters and digits.
+
 ### Fix for `undefined` in configure/RELEASE files
 
 Prevents `Use of uninitialized value` warnings from convertRelease.pl.

modules/database/src/tools/DBD/Breaktable.pm

@@ -20,6 +20,20 @@ sub init {
     return $this;
 }
 
+# Override, breaktable names don't have to be strict
+sub identifier {
+    my ($this, $id, $what) = @_;
+    confess "DBD::Breaktable::identifier: $what undefined!"
+        unless defined $id;
+    if ($id !~ m/^$RXname$/) {
+        my @message;
+        push @message, "A $what should contain only letters, digits and these",
+            "special characters: _ - : . [ ] < > ;" unless $warned++;
+        warnContext("Deprecated $what '$id'", @message);
+    }
+    return $id;
+}
+
 sub add_point {
     my ($this, $raw, $eng) = @_;
     confess "DBD::Breaktable::add_point: Raw value undefined!"