[jstet]

Closes #240.

Implements option 2 of #240. This is proposed, not decided: the maintainer decides at review whether default-on is wanted.

LimeSurvey's own defaults (allowprev=N, showxquestions=Y) are poor for surveys built from XLSForms: no Previous button, and a "This survey contains 74 questions" line that counts hidden and filtered questions. formtransform now writes allowprev=Y and showxquestions=N as S rows unless the form sets them with limesurvey_allowprev / limesurvey_showxquestions (#228).

• The defaults live in the registry (convention:surveySettings defaults, next to shownoanswer=N); src/generated is regenerated by codegen.
• A settings column wins, including allowprev=N / showxquestions=Y.
• New option surveySettingDefaults (default true) and CLI flag --no-setting-defaults leave both out, so LimeSurvey's defaults apply. shownoanswer keeps its own switch (--show-no-answer).
• The way back (limesurveySettingColumns) skips all three defaults, as it already did for shownoanswer=N, so forms without the columns round-trip unchanged.
• DDI is unaffected: it is built from the settings sheet, not from the TSV.
• README "LimeSurvey survey settings", the lstsv2xlsform README, the convention text and the skill syntax reference are updated.

Before / After S rows

Before:

class	name	text
S	language	de
S	format	A
S	shownoanswer	N

After:

class	name	text
S	language	de
S	format	A
S	shownoanswer	N
S	allowprev	Y
S	showxquestions	N

Behaviour change

Every TSV gains these two S rows, so existing forms behave differently once re-imported into LimeSurvey (Previous button on, question count off). Blessed snapshots (registry/entities, tests/fixtures/surveys) changed only by those two rows. To keep the old output, pass --no-setting-defaults or surveySettingDefaults: false, or set the columns in the form.

Tests

• npm test: 1777 passed (108 files); new cases cover defaults present, override Y/N wins, defaults off via option and CLI flag, round trip leaving the defaults out, DDI free of the defaults.
• npm run validate: passes.

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