SiteHut beta 0.1.41

This beta update expands the simple variation register and makes resource price-list imports easier to understand.

• Additions and omissions: Record separate add and omit values when creating or editing a variation, with the correct net value carried into the final account.
• Statuses that fit the variation: Variation requests, received instructions, and confirmations now use status choices and labels suited to their workflow, including Approved by Client and Rejected by Builder where relevant.
• More flexible updates: Simple variations can be updated throughout their lifecycle, with changes saved automatically.
• Approved requests: When a client approves a variation request, the register now treats it as an instructed variation.
• Clearer Library imports: A new column guide explains each resource-import field, while improved validation distinguishes estimating cost codes from resource types and shows more useful row errors.