Change use of require to work with Lua 5.2

postgresql-details-html.lsp

 <% local data, viewlibrary = ... 
-require("htmlviewfunctions")
+htmlviewfunctions = require("htmlviewfunctions")
 html = require("acf.html")
 %>
 

postgresql-listfiles-html.lsp

 <% local data, viewlibrary, page_info, session = ... 
-require("htmlviewfunctions")
+htmlviewfunctions = require("htmlviewfunctions")
 html = require("acf.html")
 %>
 

postgresql-model.lua

 module(..., package.seeall)
 
 -- Load libraries
-require("modelfunctions")
+modelfunctions = require("modelfunctions")
 fs = require("acf.fs")
 format = require("acf.format")