add TODO file

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+### Build System
+ * update Makefiles to use config.mk
+ * create VAPI file for config.h
+ * support "make install"
+
+#### CORE
+ * disallow buying for disabled users
+ * support user discounts
+ * remove hardcoded stuff from invoice and pdf-invoice
+ * drop to user rights in all daemons if started as root user
+  - [old code](https://github.com/ktt-ol/serial-barcode-scanner/commit/504cefec4a93a9b52fa9d25d6f353a4676485c43)
+
+#### libcairobarcode
+ * write vala library using cairo to generate a barcode
+
+#### USERLIST-PDF
+ * write new vala process, which generates a user list pdf using libcairobarcode
+
+#### PRODUCTLIST-PDF
+ * write new vala process, which generates a product list pdf using libcairobarcode
+  - Version 1: EAN, Barcode, Name, Amount, Buying-Price
+  - Version 2: EAN, Barcode, Name, Member-Price, Guest-Price
+ * first implement a deprecated flag for products, so that products
+   being deprecated and having an amount of zero are not shown
+   on the lists
+
+#### MAIL
+ * add PGP support in mail script
+
+#### MAIL-SERVICE
+ * IMAP client, which is parsing incoming mails from shop@ktt-ol
+ * interpret commands similar to the Debian Bug Tracker
+ * authentication is done using PGP, only signed mails are accepted
+ * support help command, which lists all supported commands
+ * support restocking via mail
+ * support requesting invoice data for own user
+ * support requesting personal data
+ * support password setup
+
+#### WEB
+ * Reimplement statistics, add cache (?)
+ * Implement User Statistics
+ * Support renaming products
+ * Admin: support to disable/enable users
+ * Admin: support to delete sales
+ * Admin: support to add sales
+ * Admin: support listing/adding/editing suppliers
+ * Support generating a barcode userlist (USERLIST-PDF)
+ * Support generating product price list (PRODUCTLIST-PDF)
+ * Support generating shopping list (PRODUCTLIST-PDF)
+ * Support to generate a sorted best before dates list
+ * Implement a more fine-grained authentication system
+ * OpenID based login
+ * SSL support
+
+#### LOG
+ * implement log daemon
+ * get logfile destination from config
+
+#### DATABASE
+ * check sqlite WAL mode
+  - http://www.sqlite.org/wal.html
+  - checkpoint operation for fsync
+
+#### SQL
+ * DISCOUNT table:
+  - userid
+  - start
+  - stop
+  - percent
+ * USER_SETTINGS table
+  - mail_mode (text, html or both)
+  - audio_theme
+ * REMOVED_SALES table
+  - userid
+  - product
+  - sale_time
+  - remover
+  - removal_time
+ * PRODUCT_NUTRITION_DATA table
+  - product id
+  - energy
+  - sugar
+  - ...
+ * PRODUCT_DEPOSIT table
+  - product id
+  - deposit (0.08€, 0.15€)
+ * PRODUCT_GROUPS table
+  - group id
+  - group name
+ * PRODUCT_AMOUNT_TYPE table
+  - amount type id
+  - amount type name (Liter, Gramm, Kilogramm, ...)
+ * PRODUCTS table
+  - add group field referencing PRODUCT_GROUPS
+  - add amount field (integer)
+  - add amount type field (reference)