added textinput option "a ::pos{system,planet,lat,lon,alt} Displayname"

Author: Merl

README.md

@@ -111,6 +111,8 @@ Welcome to Trog's SatNav for Dual Universe. This is a location/bookmark manager
     f) `l Hud` - this will copy all of the Dimencia Hud stored locations from the Hud's databank into the SatNav databank
 
     g) `x SatNav` - this command will duplicate/clone the SatNav databank if an additional empty databank has been linked to the PB in slot 5. The purpose of this feature is to enable users to copy their locations to multiple ships.
+
+    h) `a ::pos{system,planet,lat,lon,alt} Displayname` - will add a new Location to SatNav. Input validation is very basic, thus please use with care.
 
   5. When using your [Dimencia Hud](https://github.com/Dimencia/DU-Orbital-Hud), you will find that the location you loaded in 3 (above) has been renamed as `**SatNav Location**` and is now available using the `Alt+1/Alt+2` keys.. This will also have been set as the destination on the Dim Hud buttons screen. 
   > Unlike previous versions of SatNav, we now only copy across a single location to Dim Hud - this is due to a limitation in the Dim Hud which would cause a CPU overload error if we copied all of the SatNav locations across.

src/system/inputText.lua

@@ -50,4 +50,22 @@ elseif text == "x SatNav" then
     else
         system.print("Please link an empty databank to the programming board")
     end
+elseif string.sub(text,1,2) == "a " then
+    local newLocNamePos = text:find("}") 
+    if newLocNamePos > 0 then
+        -- @TODO: add more validation
+        local newLocPos = string.sub(text,3,newLocNamePos)
+        local newLocName = string.sub(text, newLocNamePos + 2, string.len(text))
+        newLocation(newLocName, newLocPos)
+        if displayPlanetList[1] ~= "" then
+            lastPlanetSelected = displayPlanetList[1]
+            lastLocationSelected = ""
+            buildPlanetLocList(lastPlanetSelected)
+            clearLocDispList()
+            selected = ""
+            CurrentLocationPage=1
+            CurrentPlanetPage=1
+            DrawPlanetList()
+        end
+    end
 end

src/unit/start.lua

@@ -603,12 +603,22 @@ function loadHudLocations()
 end
 
 
-function newLocation ()
-    local location = system.getWaypointFromPlayerPos()
+function newLocation (xnewLocName, newLocPos)
+    local location
+    if xnewLocName and newLocPos then
+        location = newLocPos
+    else
+        location = system.getWaypointFromPlayerPos()
+    end
     local newLocId = myDatabank.getIntValue("lastNewLoc") + 1
     myDatabank.setIntValue("lastNewLoc",newLocId)
 
-    local newLocName = defaultNewLocName.." ("..newLocId..")"
+    local newLocName
+    if xnewLocName then
+        newLocName = xnewLocName
+    else
+        newLocName = defaultNewLocName.." ("..newLocId..")"
+    end
 
     local num        = ' *([+-]?%d+%.?%d*e?[+-]?%d*)'
     local posPattern = '::pos{' .. num .. ',' .. num .. ',' ..  num .. ',' ..