[Valladarex]

Fixes #317.

One commit, in Source/LK1/L1U/BDF_CARD_CONTINUATIONS.f03 and Source/LK1/L1A/INPUT_STAGE_DISPATCH.f03.

How markers match: a line continues the one before it when its marker equals field 10 of that line after the first character. The first character is blank, + (small field) or * (large field) in each (TAGS_MATCH; for a free field line it is its first free field, LINE_TAG). So an entry may mix small, large and free field lines.

Changes:

• NEXTC reads a large field continuation of a small field entry.
• NEXTC2 reads a small field continuation of a large field entry. The second line's fields 2-5 give the entry's fields 6-9; data in its fields 6-9 stops with ERROR 1212.
• The first pass (NEXTC0, NEXTC20) now reads the same lines as the second.
• A wrong marker: a line whose marker is not the one in field 10 before it stops the run.
• A continuation no reader reads now gives a warning that its data is not used.

Test: MYSTRAN_Validation MystranSolver/MYSTRAN_Validation#35, grid_star_x3_small_and_free_field.bdf: two CRODs to GRID* grids whose X3 is on a small field and on a free field second line.

• Each tip must move P L / (E A cos^2) = 1.9964893E-7.
• On dev both move 1.428571E-7, with no message. With this PR both checks pass.

Also checked on this commit alone, outside the suite:

• the same GRID* with a large field second line;
• CBAR* offsets on a small field line give the small field answer;
• a small field second line with data in fields 6-9 stops (ERROR 1212);
• an unread FORCE continuation is reported;
• two decks with a mismatched marker stop and write no results.

Validation suite: with both PRs, 1 failure of 3,257 checks, the same one current dev has without them ("mitc4 thermal strain free rectangle cylinder"). The 2 new checks pass.